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Reports the usage of method <code>System.getProperty(str)</code> and suggests a fix in 2 cases:
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  <li><code>System.getProperty("path.separator")</code> -> <code>File.pathSeparator</code></li>
  <li><code>System.getProperty("line.separator")</code> -> <code>System.lineSeparator()</code></li>
</ul>
The second one is not only less error-prone but is likely to be faster,
as <code>System.lineSeparator()</code> returns cached value, while <code>System.getProperty("line.separator")</code> each time calls to Properties (Hashtable or CHM depending on implementation).
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